Latch bolt holdback



July 3, 1945. c. LEDIN ET AL LATCH BOLT HOLDBACK Filed Feb. 1, 1944 2Sheets-Sheet 1 m 3 m m y %R Fe o mwi w l I A. 0/.C m j Z" u 1 F M "Jr Wm Q, I 2 v M/d 0 2 Patented July 3, 1945 UNITED ATES PATENT OF Charles:Ledin andPhilip'T. Krause; I Stamford, Conn. 1 y aApplication:Februaryl, 1944.ser a.1 No.520.5901.

'eoiainls. (01.292469) This invention relates .toa. hold: back for" usewith a latchbolt; More; particularly, thisinvena tionirelatesto aholdiback fOlTllSB" with amight latch.

Latches, and more particularly' night latches-,1

areegenerally' equippfi'dtwith latch bolts sthat are springprojectedzandzare adaptedutobe retracted" bya thumb turnzlor theequivalentthereof. Since tiveview of anight'latch towhich-our inventionis applied. Fig. Z-isaview looking. at the back of theinig'ht latchofFig. 1 with the. rear plate: removed. Fig. v3- is.a-sectiontaken.a1ong.lines:3-3-

fer to the drawings wherein Fig. .1. is .a perspec of.-Fig.-.2.Fig.4isasection.takenalonglines 4+4.

ofFig. 3. Fig. 5 is. a.-.view similar to Fig. .3 showingthe latchboltinitsholdback position Fig.

6 is. a view similarto Fig. 2 but illustrating amodq ified. .form ofthe. invention in. which the. holdback device. istmounted. within thethumb turn. that-is. used. to. retractthe latch bolt. Fig. .7 is. asection takenalong-lines 1-1.ofFig.. 6.1 Fig. 8 is a view similar;tmE'ig... 6 but ;showing. the parts in the hold back .position 015, the.latch -bolt.. 9 is. a

retractth-e latch bolt beyond its-hold bacjkposiview of certain parts ofFig. 7 showingthe latch boltinits hold back position. I l V Referringnow more. particularly to. the. drawings, .andfespecially Figs.1-5finclusive; the latch casing of our. invention isdesig-natedbyweference numeral I!) while the latch bolt mounted-thereon. is.designatedb'y reference numeral! I. 'Ih'e latch.

boltis projected by a spring. I2 in. a conventionalmanner and. is.retracted ,by. the pin l3 extending. from a cam plate 14, that issecured as a part of athumb turn. 151' As those skilled in the. art willreadily appreciate, the structure thus far. set forth isentirely.conventional and is not per. se our inventionclaimgd herein.

The hold. back forming, our invention may. various forms but "wepreferto use that typetha t is. shown; in: Figs. 1-5; In. those'figuresflthe hold back: is shown; comprising a" push. button I6- 50; pbutton and slides within. a bore 34 in a casting take. I

mounted in a compound bore l1 formed in-thecasi-ng l0, the-inner'endofthe pushbuttonbei-ng plate riveted at [8 to a holdrback plate-(B and aspring 20-that arewithin the casing Ill.

.qAs isclearly shown in Fig. 4; the plate spring- 20 has its opposedends 2| resting within slots-22 formed in the casing, and urgesthe pushbutton.

I6" toiitsouterz release position of. Fi 3. In this position of. theparts adetent lug 23- thatis part of the hold back platel'fl; is located:belowanear 24 bent downwardly fromthe plate portion 25 of the latchbolt I I. With thelatchv bolt projected as ,in Figs. 1, 2 and3, it-may.be retracted. by rotation of the thumbturn-to-the. position oflFigl5,-thereby bringing ear of the. latch boltintoY itsdottedjline. positionof 5. In this position ofthe ear24, the push button 1-6 may be depressedfrom its dotted-1ine1position of Fig. 5 touitsiull lineposition,..and.the latchbolt then released i or projection. Thelatch.boltwill -move onlyuntil the ear 24 reaches itsiull lineaposition .ofFig. 5,

withthendetentlugzarthe hold .backplate is within the undercut n'otch2fi-yformed: in the said ear. I H

It is now obvious that the latch bolt will be held in its-hold f backposition bythe: push ibutton l 6 andits hold back platel fl, Itis alsoobviousthat the. latch bolt car 24 will hold. the push button I'fiagainstmovement to its release position-byplate f spring 20, .due to.the interlocking engagement of the. detentlug .23 with notch 26m ear 24.I

If now it is desired to projectthe latch bolt to itsposition of Fig. 1,his not=necessaryto actu-w ate the push button lfimanuallyt Itis onlynecessary to rotate the. thumb turn. [5 whereby to :tion to bringthe ear24 to its dotted line positionofiFig. 5L Springplate 20 will thenproject the push button I6 to its position of Figs. 3 and. 4

, away from ear 24, and upon releaseof the thumb turn lithe latchboltwill spring outwardly.

In that .form oflourinvention illustrated in Figs. .6-9 inclusive,.thevhold. back operatingnpush. 1 button is mounted .for sliding.movement within a thumb turn 30 rather than in a bore 0f the casing asin the first modification. In the modiiication of Figs. 6 -9, the pushbutton is designated by reference numeral 3| and it is urgeditoanoutward release positionby a spring 32jmounted aboutia guide pin 33 thatisfi'xed-to the push 35forming part of the body of the thumb turn 30; asis well illustrated in the drawings.

The pushbuttonihhasa pin 36 extending.

1 therefrom into the castingllfla of the latch bolt,

FICEY and said pin 36 is formed with a, notch 31 adapted to interlockwith the lug 38 of the plate 39 of the latch bolt 40. tracted by thumbturn 30 through its cam pin 30a, to bring the lug 38 beyond the end ofthe pin 36, the push button 3! ma be depressed to the position of Fig.9. If the latch bolt is then released for projection by its spring I2a,the lug 38 will enter the notch 31 of the pin 36. This will efiectivelyblock the movement of the latch bolt from its hold back position to itsprojected Thus, if the latch bolt is reposition and will simultaneouslyretain the push button 3| in its hold back position of Figs. 3

and 9.

If it is now desired to allow projection of ,the

latch bolt, it is only necessary to retract the latchv bolt beyond itshold back position of Figs. 8 and 9, withdrawing the lug 38 of latchbolt plate 39' v The pin 36 and push button 3! will then be springprojected to the from the notch 31 of pin 36.

release position of Fig. 7, and the latch bolt when released by thumbturn 30 will spring outwardly to its position of Figs. 6 and '7.

We believe that the operation" and constructionof our invention will nowbe apparent to those skilled in the art. 1

We now claim: I '1. In a lock of the-class described, a casing, alatchbolt slidable on said-casing from a projected to a retractedposition, a spring urging said latchbolt to its projected position, apush button, means mounting saidpush button for inward and outwardsliding movement relatively to said casing, a spring pressing said pushbutton outwardly relatively to said casing, means movable with to aretracted position, a spring urging said latchbolt to its projectedposition, a hold back button, means mounting said button for movementrelatively to said casing, a spring pressing said button into a releaseposition, means movable with said button against the force of saidbuttonspring into hold back position to prevent movement of said latchbolt bysaid latch bolt spring from a retracted hold back position to aprojected position,

and a part of i said latchbolt engaging said means whereby saidlatchbolt holds said hold back button against movement to releaseposition.

3. In a lock of the class described, a casing, a latchboltslidable'onsaid casing from a projected to a retracted position, aspring urging said latch bolt to its projected position, a'hold backbutton, means mounting said button for movement relatively to saidcasing, a spring pressing said button into a release position, meansmovable with said button against the force of said button spring intohold back position to prevent movement of said latch bolt by said latchbolt spring from a retracted hold back position to a projected position,and a part of said latchbolt engaging said means whereby said latchboltholds said hold back button against movement to releaseposition,theretractionof said latchboltbeyond its hold back position releasing saidhold back button for movement by its spring to its release posi-- tion.a

4. In a lock of the class described, a casing, a latchbolt slidable onsaid casing from a projected to a retracted position, a spring urgingsaid latchbolt to its projected position, a push button mounted forsliding movement in a bore in said casing with the head of the pushbutton exposed on the outside of the casing, a spring pressings'aidbutton outwardly of said casing ,into release position, meansmovable with said button against the force of said button springinwardly of said bore into hold back position to prevent movement ofsaid latchbolt by said latch bolt spring from a retracted hold backposition to a projected position, and apart of said latchbolt engagingsaid means whereby said latchbolt holds said push button againstmovement outwardly of said bore to said release position.

5. ma lock of the class described, a casing, a latchbolt slidable onsaid casing from a projected to a retracted position, a spring urgingsaid latchbolt to its projected position, a push button mounted forsliding movement in a bore in said casing with the head of the pushbutton exposed on the outside of the casing, a spring pressing saidbutton outwardly of said easing into release position," means movablewith said button inwardly of said bore against the force of said buttonspring into hold back position to prevent movement of said latchbolt bysaid latchbolt mounted for rotation on said casing, means ro-,

tatable with said thumb turn for retracting said latchbolt, 'a hold backbutton, means mounting said hold back button on said thumb turn with apart of said button extending inwardy of aid casing, a spring pressingsaid button relatively to said thumb turn into a release position, meansmovablewith said button against the force of said button spring intohold back position to prevent projected position, and a part of saidlatchbolt engaging said means whereby said latchbolt holds said holdback button against movement to re lease position. j

7. In a lock of the class described, a casing, a latchboltslidable onsaid casing from a projected to a retracted position, a spring urgingsaid latchbolt to its projected position, a thumb turn mounted forrotation on said casing, means rotatable with said thumb turn forretracting said movable with said button against the force of saidbutton spring into hold back position to prevent movement of saidlatchbolt by said latchbolt spring from a retracted hold back positionto a projected position, and a part of said latchbolt engaging saidmeans whereby said latchbolt holds 2,379,810 t a i said hold back buttonagainst movement to release position, the retraction of said latchboltbeyond its hold back position releasing said hold back button formovement by its spring to said release position. v

8. In a lock of the class described, a casing, a latchboltslidable onsaid casing from a projected to a retracted position, a spring urgingsaid latchbolt to its projected position, a thumb turn mounted forrotation on said casing, means rotatable with said thumb turn forretracting said latchbolt, a hold back button, means mounting said holdback button in a bore of said thumb turn for inward and outward slidingmovement withv a part of said hold back button extending inwardly ofsaid casing and the head of said hold back button exposed outwardly ofsaid thumb turn bore for depression, a spring pressing said buttonoutwardly of said thumb turn bore into release position, means movablewith said button against the force of said button spring into hold backposition to prevent movement of said latchbolt by said latchbolt springfrom a retracted hold l back position to a pro'jectedposition, and apart ment to said release position.

latchbolt, a hold back button, means mounting said hold back button in abore of said thumb turn for inward and outward sliding movement with apart of said hold back button extending inwardly of said casing and thehead of said holdv back button exposed outwardly of said thumb turn borefor depression, a spring pressing said 'button outwardy of said thumbturn bore into release position, means movable with saidbutton againstthe force of said button spring into hold back position to preventmovement of said latchbolt by said latch bolt spring from a retractedhold back position to a projected position, a part of saidv latchboltengaging said means whereby said latchbolt holds said hold back buttonagainst movement to said release position, the retraction of saidlatchbolt by said thumb turn releasing said button for movement to saidrelease position. i

CHARLES LEDIN. I PHILIP T. KRAUSE.

